Evolution photos

Evolution photos

Evolution photos

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Scientists photographing dinosaur trackways

Scientists photographing dinosaur trackways

Juvenile Acrocanthosaurus print with human foot for scale

Juvenile Acrocanthosaurus print with human foot for scale

Exposing dinosaur footprints in the Paluxy River

Exposing dinosaur footprints in the Paluxy River

Photosynthetic tree bark

Photosynthetic tree bark

Bighorn sheep in Badlands

Bighorn sheep in Badlands

Prairie dog in Badlands

Prairie dog in Badlands

Tundra wildflower in Montana

Tundra wildflower in Montana

Tundra lily in Montana

Tundra lily in Montana

Alpine meadow columbine

Alpine meadow columbine

Miocene leaf fossil, Idaho

Miocene leaf fossil, Idaho

Fossilized Miocene leaf, Idaho

Fossilized Miocene leaf, Idaho

Miocene leaf with fall color, Idaho

Miocene leaf with fall color, Idaho

Echinocereus cactus, Black Mesa, Oklahoma

Echinocereus cactus, Black Mesa, Oklahoma

Hantavirus house, Oklahoma

Hantavirus house, Oklahoma

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Bighorn sheep in Badlands

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Bighorn sheep in Badlands

A baby bighorn sheep follows its mother in Badlands National Park (2014). Stanley Rice photo.